I have started in safe mode and the results were the same when using the previous names (HelloWorld.epub and Helloworld2.epub): calibre-viewer failed for the same articles.
That is what I expected because I guess the viewer use in safe mode the cache previously generated in normal mode.
So, I renamed the file (in safe mode) to Helloworld3.epub and the results were similar to normal mode: the viewer failed for feed-0 (article-43), feed-1 (article-34) and feed-3 (article-18 and article-32).
I have checked for realistic recipes and the failure rate is similar: about 2% or 3% of the articles in the epub file are wrong (the "next" button fail and, as unkn0wn mentioned above in his first post, the viewer gets stuck and you have to close the viewer and reopen file)
Please find attached cache files for HelloWorld, HelloWorld2 and HelloWorld3, in case you think they are useful.
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